The pH is affected by the presence of
ammonium ion or ammoniac (Randall and Tsui, 2002).
The demonstrated sensitivity is 3.4%/m for
ammonium ion (NH4+).
(1993) the excessive absorption of the
ammonium ion contributes to promote the electrochemical imbalance in the interior of the cells and of the intracellular pH, which stimulates the extrusion of ions to the apoplast.
The amount of nitrogen fixed was determined by indirect evaluation of the reduced nitrogen amount in the form of
ammonium ion, using the Berthelot colorimetric method, described by Barraza and Perez (9).
However, in the presence of ammonia, the electrostatic attraction between free water and negative charged lattices of OH-groups decreases significantly, which produces a new
ammonium ion. This excess proton can be delivered to a new unoccupied site or another N[H.sub.3] molecule [5].
However, to our knowledge there are only 3 works devoted to investigate tetrakis [Eu.sup.3+] complexes with DBM ligands with general structure [Eu[(DBM).sub.4]] ([Eu.sup.3+] complex is anionic and charge neutralization is required by quaternary
ammonium ion countercation) [6-8].
According to CASTING (1998), the capacity to absorb ammonia by zeolites is mainly because of
ammonium ion exchange (N[H.sub.4.sup.+]), which makes the use of the additive possible.
The pH has an important effect on ammoniacal nitrogen removal since it can impact the character of
ammonium ion. When the pH value is higher than 7, the adsorption capacities of ammoniacal nitrogen decrease, because the
ammonium ion is transformed to nonionized forms of ammonia gas, which is unfavorable for adsorption on X/AC composite [36-38].
The experiment to reduce
ammonium ion concentrations in the fugate was carried out by filtering it through zeolite filler.
Nitrates show the spatial variation Sami as the
ammonium ion. By contre nitrate levels fluctuate entre 1.46 and 7.69 mg/l, Ortho phosphates Meanwhile, show averages around 0 and 2.40 mg/l.
Mixture of 1,10-phenanthroline-5,6-dione 2 (0.212g,1mmol), 4,4-biphenyldicorboxyl adehyde 3 (0.210g, 1mmol) and (1g,15mmol) of
ammonium ion were taken in a 50 mL round bottom flask, 5mL of glacial acetic acid was added as solvent and refluxed for 3 h.
The low urinary sodium owing to severe diarrhea allows for the coupling of urate with the abundant
ammonium ion. This coupling, combined with at least a transient state of ammonium urate supersaturation, promotes the formation of AAU stones [9].
